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use crate::{html::attributes, Attribute, Element, Node};
use std::fmt;
pub trait Render {
fn render(&self, buffer: &mut dyn fmt::Write) -> fmt::Result {
self.render_with_indent(buffer, 0, &mut Some(0), false)
}
fn render_compressed(&self, buffer: &mut dyn fmt::Write) -> fmt::Result {
self.render_with_indent(buffer, 0, &mut Some(0), true)
}
fn render_with_indent(
&self,
buffer: &mut dyn fmt::Write,
indent: usize,
node_idx: &mut Option<usize>,
compressed: bool,
) -> fmt::Result;
fn render_to_string(&self) -> String {
let mut buffer = String::new();
self.render_compressed(&mut buffer).expect("must render");
buffer
}
}
impl<MSG> Render for Node<MSG> {
fn render_with_indent(
&self,
buffer: &mut dyn fmt::Write,
indent: usize,
node_idx: &mut Option<usize>,
compressed: bool,
) -> fmt::Result {
match self {
Node::Element(element) => {
element.render_with_indent(buffer, indent, node_idx, compressed)
}
Node::Text(text) => write!(buffer, "{}", text.text),
}
}
}
fn extract_inner_html<MSG>(merged_attributes: &[Attribute<MSG>]) -> String {
merged_attributes
.iter()
.flat_map(|attr| {
let (_callbacks, _plain_values, func_values) =
attributes::partition_callbacks_from_plain_and_func_calls(
&attr,
);
if *attr.name() == "inner_html" {
attributes::merge_plain_attributes_values(&func_values)
} else {
None
}
})
.collect::<Vec<_>>()
.join(" ")
}
impl<MSG> Render for Element<MSG> {
fn render_with_indent(
&self,
buffer: &mut dyn fmt::Write,
indent: usize,
node_idx: &mut Option<usize>,
compressed: bool,
) -> fmt::Result {
write!(buffer, "<{}", self.tag())?;
let ref_attrs: Vec<&Attribute<MSG>> =
self.get_attributes().iter().map(|att| att).collect();
let merged_attributes: Vec<Attribute<MSG>> =
mt_dom::merge_attributes_of_same_name(&ref_attrs);
for attr in &merged_attributes {
if !attr.name().is_empty() {
write!(buffer, " ")?;
attr.render_with_indent(buffer, indent, node_idx, compressed)?;
}
}
#[cfg(feature = "with-nodeidx-debug")]
if let Some(node_idx_) = node_idx {
let node_idx_attr: Attribute<MSG> =
crate::prelude::attr("node_idx", *node_idx_);
write!(buffer, " ")?;
node_idx_attr
.render_with_indent(buffer, indent, node_idx, compressed)?;
}
if self.self_closing {
write!(buffer, "/>")?;
} else {
write!(buffer, ">")?;
}
let children = self.get_children();
let first_child = children.get(0);
let is_first_child_text_node =
first_child.map(|node| node.is_text()).unwrap_or(false);
let is_lone_child_text_node =
children.len() == 1 && is_first_child_text_node;
if is_lone_child_text_node {
node_idx.as_mut().map(|idx| *idx += 1);
first_child
.unwrap()
.render_with_indent(buffer, indent, node_idx, compressed)?;
} else {
for child in self.get_children() {
node_idx.as_mut().map(|idx| *idx += 1);
if !compressed {
write!(buffer, "\n{}", " ".repeat(indent + 1))?;
}
child.render_with_indent(
buffer,
indent + 1,
node_idx,
compressed,
)?;
}
}
if !is_lone_child_text_node && !children.is_empty() {
if !compressed {
write!(buffer, "\n{}", " ".repeat(indent))?;
}
}
let inner_html = extract_inner_html(&merged_attributes);
if !inner_html.is_empty() {
write!(buffer, "{}", inner_html)?;
}
if !self.self_closing {
write!(buffer, "</{}>", self.tag())?;
}
Ok(())
}
}
impl<MSG> Render for Attribute<MSG> {
fn render_with_indent(
&self,
buffer: &mut dyn fmt::Write,
_indent: usize,
_node_idx: &mut Option<usize>,
_compressed: bool,
) -> fmt::Result {
let (_callbacks, plain_values, _func_values) =
attributes::partition_callbacks_from_plain_and_func_calls(&self);
if let Some(merged_plain_values) =
attributes::merge_plain_attributes_values(&plain_values)
{
write!(buffer, "{}=\"{}\"", self.name(), merged_plain_values)?;
}
Ok(())
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::prelude::*;
#[test]
fn test_render_classes() {
let view: Node<()> =
div(vec![class("frame"), class("component")], vec![]);
let expected = r#"<div class="frame component"></div>"#;
let mut buffer = String::new();
view.render(&mut buffer).expect("must render");
assert_eq!(expected, buffer);
}
#[test]
fn test_render_class_flag() {
let view: Node<()> = div(
vec![
class("frame"),
classes_flag([("component", true), ("layer", false)]),
],
vec![],
);
let expected = r#"<div class="frame component"></div>"#;
let mut buffer = String::new();
view.render(&mut buffer).expect("must render");
assert_eq!(expected, buffer);
}
}